Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2b5cd71e1c8177…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 03:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f74ec801c3ae4e9d37a9b6ce7ccb7997 SHA-1: cf33ba2e78b71cf44418d6f62e69807e410a7000 SHA-256: 8d2b5cd71e1c8177638ef2707c5de647b944cc12502bcf350a2b96855634a6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://fluorescent-training.com/file/80315330482.pdf In PDF document text
    • http://frangarcia.eu/upload/file/pegegenodifutijakalumabom.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/purexojoxe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/78fab9c781c5d863c172dd84ef5e1f2f/9920675176.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/27768964897.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/guu0uoclvv8kng5095jnmkbj61/86277857384.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/11540333396.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/botopufozulali.pdfIn PDF document text
    • https://insp.biz/img/file/55099194128.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/69345243510.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/nogunatipisuzoj.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/dilasoxodumirepuv.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148fb87ec691---senuwa.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/guxezijuwoxevagumu.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/63153668795.pdfIn PDF document text
    • https://guijek.com/userfiles/file/mixifumewu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb5c5716e5---burofiva.pdfIn PDF document text
    • https://x-software.cz/data/file/dizevobij.pdfIn PDF document text
    • http://feketemeheszet.hu/UserFiles/File/romagiwosadutuwelomukixo.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/30620767013.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/gugidifuxuzap.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jurelokukemefidizejijav.pdfIn PDF document text
    • http://vinmexindia.com/uploads/69196437901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+share+calendar+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB208 10544 bytes
SHA-256: 4ad302db10a8f06138c002070f970c144f6f2c322dbc609deab1ff367418bb2c
font_01_sfnt_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 14648 bytes
SHA-256: 6c1a92992eb948c299375e0e0b257f7e61b61abecbf57f8aca15a9b6453b8964